If you're going to make a beauty line, you've got to be a little selfish, at least with one product. For Grande, that was the Practically Permanent Lip Stain Marker (£16). "It was always something I would desperately try to find the perfect one," she said. "You can put on a little thin layer of it, and it can feel more natural. Then, you can do more, and it's like Morticia Addams. It's exciting." Exciting is true, because unlike so many stains that come in the form of a messy liquid, this one uses a bleed-free marker applicator instead.